P2212 [USACO14MAR]浇地Watering the Fields 题目描述 Due to a lack of rain, Farmer John wants to build an irrigation system to send water between his N fields (1 <= N <= 2000). Each field i is described by a distinct point (xi, yi) in the 2D plane, with 0 &…

P2212 [USACO14MAR]浇地Watering the Fields 题目描述 Due to a lack of rain, Farmer John wants to build an irrigation system to send water between his N fields (1 <= N <= 2000). Each field i is described by a distinct point (xi, yi) in the 2D plane, with 0 &…

P2212 [USACO14MAR]浇地Watering the Fields 题目描述 Due to a lack of rain, Farmer John wants to build an irrigation system to send water between his N fields (1 <= N <= 2000). Each field i is described by a distinct point (xi, yi) in the 2D plane, with 0 &…

题目链接: https://www.luogu.org/problemnew/show/P2212 思路: 一道最小生成树裸题(最近居然变得这么水了),但是因为我太蒻,搞了好久,不过借此加深了对最小生成树的认识. 首先这明显是个稠密图,有\(\sum_{n-1}^{i=1}i=n*(n-1)/2\)条边,看起来\(Prim\)会明显优于\(Kruskal\),于是这道题我用了三种方法 \(Kruskal\) 简单易懂,简洁优美 耗时/内存 344ms, 24343KB 代码: #include…

https://www.luogu.org/problem/show?pid=2212 题目描述 Due to a lack of rain, Farmer John wants to build an irrigation system to send water between his N fields (1 <= N <= 2000). Each field i is described by a distinct point (xi, yi) in the 2D plane, with…

传送门 题解:计算欧几里得距离,Krusal加入边权大于等于c的边,统计最后树的边权和. 代码: #include<iostream> #include<cstdio> #include<cstring> #include<algorithm> #define maxn 2009 using namespace std; int n,c,cnt,tot,ans; int xi[maxn],yi[maxn],fa[maxn]; struct Edge{ int…

题目描述 Due to a lack of rain, Farmer John wants to build an irrigation system tosend water between his N fields (1 <= N <= 2000).Each field i is described by a distinct point (xi, yi) in the 2D plane, with 0 <= xi, yi <= 1000. The cost of buildi…

3479: [Usaco2014 Mar]Watering the Fields Time Limit: 10 Sec  Memory Limit: 128 MBSubmit: 81  Solved: 42[Submit][Status] Description Due to a lack of rain, Farmer John wants to build an irrigation system to send water between his N fields (1 <= N <=…

MST...一开始没注意-1结果就WA了... ---------------------------------------------------------------------------- #include<cstdio> #include<cstring> #include<vector> #include<cmath> #include<algorithm> #include<iostream>   #define r…

3479: [Usaco2014 Mar]Watering the Fields Time Limit: 10 Sec  Memory Limit: 128 MBSubmit: 174  Solved: 97[Submit][Status][Discuss] Description Due to a lack of rain, Farmer John wants to build an irrigation system to send water between his N fields (1…